Creating Web Buzz
Word of mouth promotion, also known as buzz marketing, is highly valued by marketers. Many people feel that this form of communication has valuable source credibility.
People are more inclined to believe word of mouth promotion than more formal forms of promotion because the communicator was satisfied by the goods or services provided and is unlikely to have an ulterior motive.
Also, people tend to believe people who they know. In order to manufacture word of mouth communications, marketers use publicity techniques. Word-of-mouth effects in the life cycle of cultural goods have been mathematically modeled (Hidalgo, Castro & Rodriguez-Sickert 2006).
Creating buzz with word of mouth is a natural viral type of marketing. In this I mean that like any item used for viral marketing, videos, games, counters on the web… a good story of first told insight is naturally spread amongst friends through conversational demand to impress or enlighten.
excerpts from wikipedia.com